Abstract
Photoconduction in liquid xenon has been measured as a function of photon encrgy E. light intensity I, and electric field F . In the transparent region E 8.9 eV large photocurrents exist: they are attributed to direct creation of electrons and holes with a quantum efficiency of at least 25 %, Thus the single particle band gap is directly determined to be 8.9 eV, which is in agreement with the gap expected from current intei-pretations of condensed rare gas spectra. All currents are linear in I. From the dependence nnF it is shown that an unbound electron hole pair created by a photon E > 8.9eV mal subsequently recombine with each other and not contribute to the current. The criteria for such self recombination. which can play a large r61e in the observation of photoconductivity, are discussed.
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